Improvement in superheating and feeding exhaust steam to furnaces



2 Sheets-Sheetl. J. C. & H. MERRYWEATHER & C. J. W. JAKEMAN.

SUPERH'EATING AND FEEDING EXHAUST STEAM T0 FURNACES.

Patented Oct. l0, 1876.

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J'. C. & H. MERRYWEATHER & C. I. W. JAKEMAN.

SUPERHEATING AND FEEDING EXHAUST STEAM To FURNACES. No.183,014. Patentedoct.1o,1s7e.

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VUNITEE STATES PATENT OEEroE5 JAMESC. MERRYWEATHER, HENRY MERRYWEATHER,AND CHRISTOPHER J. W. JAKEMAN, OF LONDON, ENGLAND.

IMPROVEMENT-IN :SUPERHEATING AND FEEDING EXHAUST STEAM T0 FURNACES.

Specification forming part of Letters Patent No. 183,014, dated October10, 1876; application filed April 3, 1876.

1o all whom it may concern:

Beit known that we, JAMES COMPTON MER- EYwEATnEE and HENRY MEEEYWEATEEE,both of the firm of MEEEYwEATHEl-tt Sons, of Long Acre, in the county ofMiddlesex, and Lambeth, in the county of Surrey, and CHRIS- TOPHER J oENWALLACE J AKEMAN, of South Hackney, in the county of Middlesex, all inthat part of her Majestys Kingdom of Great Britain and Ireland calledEngland, have invented new and useful Improvements in Superheating andFeeding Exhaust Steam to Furnaces, Locomotives, &;o., which invention isfully set forth in the following specification, reference being had tothe accompanying drawings. y

This invention .relates to arrangements whereby the exhaust-steam fromthe propelling-engines of the locomotives may be disposed of withoutnoise or visible vapor. For this purpose the exhaust-steam, afterleaving the cylinders of the engine, is caused to pass partly into achamber situated at the base of the chimney, and having a perforated topopening into or communicating with the chimney, and partly through arose or nozzles arranged beneath the re-gra'te, through which the steamfrom such rose or nozzles is projected and caused to pass through a deeptire, whereby the steam is partly decomposed and partially consumed, therest being so highly superheated as to be invisible on leaving thechimney. A cock or valve is provided on each side to regulate thequantity of steam admitted below the fire-grate. The more this is closedthe greater will be the pressure in the chamber, and consequently thegreater the draft through the fire. By opening or closing this cock orvalve the production of steam may be regulated to meet the requirementsof the engine. The steam may be projected through the ire in the form ofone, two, or more conical jets drawing in air, or the steam may beinjected over the re; but we prefer passing it through the re, asthereby its decomposition is more completely effected, the hre-bars arecooled, and considerable saving in fuel is effected. In some cases weadmit air over the tire-bars to assist the combustion of the decomposedsteam.

The chamber above referred to may be made of copper. The perforations oroutlets at its upper part are of larger area than the steaminlets, sothat the steam in the chamber is expanded as well as heated therein, andpasses noiselessly and invisibly up the chimney. In some cases the wholeof the exhaust steam may be passed through the fire.

We so arrange the safety-valve that the lire is automatically deadenedwhen more steam is produced than is being used by providing thesafety-valve with a prolonged outlet, terminating in a downwarddirection within the chimney, or lire box or due, in such manner that onthe safety-valve being opened by excess of steam pressure within theboiler the escaping steam shall be projected onto the tire, whosesurface will thereby be deadened, thus checking the production of steam.As the excessive production of steam will cease, and the valve willconsequently close as soon as the top of the tire has been cooled, therewill always be a solid body of re left, which will light up immediatelywhen the engine is started.

Our invention is applicable to engines and boilers in tended for otherpurposes than tramway locomotives.

Such being the nature of our invention, we now proceed to describe themanner in which we carry it into practical effect, as illustrated in theaccompanying drawings, premisin g that we do not contine ourselves tothe precise arrangements shown in the drawings, as they may be modied tosuit circumstances without departing from the distinctive character ofour invention.

Figure 1 is a transverse vertical section of a locomotive embodying ourinvention. The boiler of the engine here illustrated is one of the kindnow well known as the Field boiler, being constructed with pendentwatertubes; but it will be obvious that our invention is equallyapplicable to boilers of other constructions.

a are the exhaust-pipes leading from the cylinders of the engine. b isthe chamber through which aportion of the exhaust steam is caused topass, such steam being conducted into the said chamber by the pipes g.

the cocks for regulating the distribution of the exhaust steam and hhthe rods by which they may be operated. The more these cocks are openedthe greater Will be the proportion of steam escaping by the nozzles d,and passing through the grate f and re, and the smaller will be theproportion of exhaust steam passing by the pipes g through the chamberb. e is the ashpan. h is the lever for Working the cocks c.

Fig. 2 shows a modified arrangement of our invention applied to anordinary vertical boiler. In this arrangement a rose, q, is substitutedfor the nozzles d, (shown in Fig. 1,) and one cock, c, is provided. Thearrangementin other respects resembles the previous one, and will bereadily understood from the drawings, the parts being similarlylettered.

Fig. 3 is a longitudinal vertical section of' a horizontal locomotiveboiler with the first part of our invention applied to it. In this casea perforated tube, r, is substituted for the rose and nozzles ofprevious arrangements.

What We claim is- 1. The combination, with the exhaust-steam pipes a ofan engine, of the chamber b, pipes g, and nozzles d, arranged inrelation to the specified.

J. C. MERRYWEATHER. HENRY MERRYWEATHER, O. J. W. JAKEMAN.

Witnesses to the signatures of the' said J AMES CoMPToN MERRYWEATHERand. HEN- RY MERHYWEATHER:

F. J. BRoUGHAM,London. E. KINGGOMBE, London.

Witnesses to the signature of the said CHRISTOPHER JOHN WALLACE J AKEMANHENRY CHAPMAN,

113 Victoria st., Westminster,

London, Engineer. HENRI VAsLIN.

11 Rue Louis le Grand,

Paris, Engineer.

